小编som*_*omu的帖子

在查看实际执行计划时，即使查询不到 1 秒，它也会显示缺少索引。

SELECT
    Account.AccountID,
    Account.Name
FROM
    account      
    LEFT OUTER JOIN accountfeaturesetting afs 
ON afs.accountid = account.accountid   
and afs.featureid = 'Schedules'
 and  
afs.settingid = 'EditReasons'           
WHERE
    ISNULL(afs.Value, '0') = '0'  
    AND EXISTS 
(SELECT 1 FROM program WHERE program.AccountID = account.AccountID
 AND program.Active = 1 
AND (program.ScheduleEditReasonFlags <> 0 
OR program.ScheduleEditReasonFields <> 0))
    AND account.IsMaster = 0
    AND account.BeginDate IS NOT NULL

执行计划显示：

CREATE NONCLUSTERED INDEX [<Name of Missing Index, sysname,>]
ON [dbo].[Account] ([IsMaster],[BeginDate])
INCLUDE ([AccountID],[Name])

即使查询只需要 1 秒，我们是否需要创建索引？应该在什么基础上创建索引？

我将把这个查询作为日常工作来运行。